google/closure-compiler

Unknown type 'BeforeUnloadEvent'

Open

#3,987 创建于 2022年8月16日

在 GitHub 查看
 (3 评论) (0 反应) (0 负责人)Java (7,176 star) (1,197 fork)batch import
help wanted

描述

test.js:

/** @type {BeforeUnloadEvent} */
var a;

Compiled with closure-compiler -O ADVANCED --js test.js --js_output_file test.min.js version v20220601:

test.js:1:11: WARNING - [JSC_UNRECOGNIZED_TYPE_ERROR] Bad type annotation. Unknown type BeforeUnloadEvent
  1| /** @type {BeforeUnloadEvent} */
                ^

0 error(s), 1 warning(s)

That's strange, since the following executed in the browser:

onbeforeunload = function(e) {
    console.log(e);
    e.preventDefault();
    return "";
};

returns BeforeUnloadEvent in the console. Why does GCC not support it?

贡献者指南

技术栈
javascript
领域
tooling
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
under 1 hour
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
Basic JavaScript type annotations
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
60
研究方向
Look in the Closure Compiler source code for where DOM event types are defined, likely in externs files. Search for existing event types like Event or BeforeUnloadEvent. If missing, add a definition for BeforeUnloadEvent that extends Event. Ensure it is properly imported and recognized by the type system.